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Science 5 March 1971:
Vol. 171. no. 3974, pp. 895 - 896
DOI: 10.1126/science.171.3974.895
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Articles

Time Scales for Lithium Depletion and Rotational Braking in Solar-Type Main-Sequence Stars

E. P. J. van den Heuvel 1 and P. S. Conti 2

1 Astronomical Institute, Rijks Universiteit, Utrecht, The Netherlands, and Astrophysical Institute, Vrije Universiteit, Brussels, Belgium
2 Lick Observatory, University of California, Santa Cruz 95060

The new age determination of 9 x 108 years for the Hyades yields an e-folding time for lithium depletion in G dwarfs of 1.1 x 109 years and an e-folding time for rotational braking of around 2.2 x 109 years. A proposal is made that the change in solar rotation over the past 250 million years be determined by analyzing petrified trees.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)